Reference for “XPath and XQuery Functions and Operators 1.1”

@TechReport{Kay:09:XXF,
  author      = "Michael Kay",
  title       = "{XPath} and {XQuery} Functions and Operators {1.1}",
  month       = dec,
  note        = "http://www.w3.org/TR/2009/WD-xpath-functions-11-20091215/",
  year        = "2009",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}